Question: How many speakers were Polish on 1-1-2007?
Paraphrase: What number of people spoke Polish on 1-1-2007?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q809 p:P1098 ?s . ?s ps:P1098 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2007')) }